With the Cayin RU9, an extraordinary device enters the stage of mobile audio technology: a portable USB DAC with an integrated vacuum tube, designed to enable audiophile sound enjoyment on the go. The RU9 combines classic tube technology with modern digital technology and is particularly interesting for users who appreciate uncompromising sound even away from stationary systems. The compact format, sophisticated connectivity and elegant finish make the Cayin RU9 an exciting new addition to the range of mobile high-end amplifiers.
- Integrated Nutube 6P1 tube for authentic tube sound
- Dual-mono DAC with AKM AK4493s for maximum precision
- Balanced and unbalanced headphone connection
- Three switchable sound characteristics: classic, modern, solid state
High-fidelity on the go – with tube charm
The Cayin RU9 clearly stands out from other portable DAC/amps, not least thanks to the integration of a Nutube 6P1 vacuum tube – a first in this form factor. The tube provides the warm, slightly saturated sound character that many hi-fi enthusiasts prefer. However, this is not a must: at the touch of a button, you can switch to a semiconductor mode, which delivers a more neutral reproduction. The choice of three sound profiles – “Classic”, “Modern” and “Solid State” – allows easy adaptation to music style, headphones and personal taste.
At the heart of the digital signal processing are two AK4493s DACs in dual-mono mode, which enable a high degree of resolution, dynamics and richness of detail. This architecture raises the device to a level that is otherwise reserved for stationary setups. Support for high-resolution audio formats and an internal battery power supply ensure that source devices – be it smartphones, tablets or digital audio players – remain unaffected in terms of their battery performance. The magnetic housing facilitates mobile use by attaching the RU9 directly to compatible devices.
Intelligent technology in a compact form
Despite its complex technology, the Cayin RU9 remains pleasantly portable: weighing just 150 grams and with an aluminum housing measuring 100 x 70 x 15 mm, it is barely larger than a pack of cigarettes. The integrated 2000 mAh battery provides almost five hours of operation and can be quickly recharged via USB-C. Operation is intuitive thanks to a precise volume roller and function buttons on the side, which provide direct access to the output mode, sound profile and volume.
Another highlight is the small OLED display, which shows all relevant information – from the set volume to the current sound profile and remaining battery capacity. On the connection side, both an unbalanced 3.5 mm output and a balanced 4.4 mm connection are available. Both outputs can be operated flexibly between tube and transistor mode. The USB interface supports UAC 1.0 and 2.0, ensuring broad compatibility with Android, iOS and PC systems. Wireless connection via Bluetooth including LDAC is also supported – a special feature in this device class.
Premium audio on the go – without compromise
With the RU9, Cayin brings high-end audio to the mobile world – uncompromising and innovative. The combination of classic tube technology, modern digital architecture and versatile connectivity makes the device a serious option for music lovers with the highest demands on sound and mobility. Despite its high audiophile standards, the RU9 remains easy to operate and well thought-out in terms of everyday usability.
The Cayin RU9 will be available from mid-July. The price is 598.00 euros (RRP, incl. VAT). A high-quality leather case for safe transportation is included.
